These dimensions are copied from factory drawings, from the PDF provided by Ginetta France.
Dimensions
Trailers
Ifor Williams tralier, type CT136 twin axle with tyre rack. The trailer is light (500 KG with no extras) and a good size for a G40.
Here are two pictures to show how the tyre rack works with a straight bar. The system is locked with a padlock.
Brian James Clubman trailer, an older equivalent of the current A4, and while this is a bit more difficult to use, there is no issue with the G40 bottoming out when loading.
Other suitable trailers: